Twyer for cupola-furnaces.



Patented May 7, |90I.

a. Amun. TWYER FUR CUPOLA FURNACES.

(Appliation led July 30, 1900.)'

(No Model.)

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UNITED. STATES' PATENT OFFICE.

GEORGE A. TRUE, OF DETROIT, MICHIGAN.

TWYER FOR CUPOLA-FURNACES.

SPECIFICATION forming part of Letters Patent No. 673,668, dated May 7,1901.

Application filed July 30, 1900. Serial No. 25,336. (No 11106.61.)

To all whom t may concern:

Beit known that I, GEORGE A. TRUE, a citi'- zen of the United States,residing at Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Twyers forCupola-Furnaces, of which the following is a specification, referencebeing had therein to the accompanying drawings.

The invention has reference to an improved type of twyer forcupola-furnaces; and it consists, essentially, in the peculiarconstruction of the twyer and in the novel means employed for adjustingthe latter, as will be more fully hereinafter set forth. P

In the construction of cupola-furnaces it is desirable for well-knownreasons to provide a blast which will reach the center as well as theoutside portion of the cupola. Heretofore center twyers have beenemployed for this purpose or twyers arranged in the side of the cupola,through which a strong blast is forced of sufficient pressure to reachthe cupola-center. The first type of twyer is objectionable for thereason that dificulty is experienced.

in maintaining the twyer, as the latter usually passes up through thebottom of the furnace and is quickly burned out. It is alsounsatisfactory to force a volume of air in large units at high pressurethrough the side of the cupola, as it is liable to cool the slag comingdown from above with the molten iron, and` thus obstruct the opening ofthe twyer. To obviate these objectionable features, I have designed acompound twyercapable of discharging air into the cupola from the sideof the latter at dierent pressures, a high-pressure blast of suitablevolume being provided for the cupola-center and a low-pressure blast forthe maximum portion of heating area, which is toward the exterior of thecupola.

In the drawings illustrating my invention, Figure l is a horizontalsection th rough a cupola-furnace and through a series .of my improvedtwyers arranged therein. Fig. 2 is a vertical central section throughone of the twyers and a portion of the cupola, illustrating theadjustable mechanism for the twyer; and Fig. 3 is a detached perspectiveViewl of the twyer.

The reference-letter A represents the usual shell or casing of a cupola,provided with a series of twyer-openings B and an inner lining C offire-brick.

D designates my improved twyer, a series of which are preferablyarranged within the cupola, as illustrated in Fig. l.

In construction each twyer is composed of an upper wall E, a lower wallF, and side walls G, as plainly shown in Fig. 3. The upper wall or topof the twyer is preferably arranged at an angle to the lower wall, andthe side Walls G diverge at their inner ends or front. Within the twyerare arranged the spaced partitions H and I, respectively, the front orinner ends of said partitions converging and the outer or rear endsdiverging, as plainly indicated in Figs. l and 3. These partitions,arranged centrally within the twyer and in the relation to each other asset forth, dividev the interior of the twyer into a multiple ofairpassages, the center passage J being adapted to discharge air at ahigh pressure and the adjoining passages K and L at a lower pressure.Each twyer is arranged Within its respective opening, as shown in thedrawings, and is adj ustably secu red to the shell or casing in themanner and for a purpose hereinafter set forth. Extending about theseries of twyers is an air-.chamber M, the wall O of which is secured tothe shell in any suitable manner, and P is a blast-pipe whichcommunicates with the chamber. It will be thus seen from the descriptionof my twyer that an air-blast entering the twyer from the airchamberwill be divided, a portion of theblast being discharged through thecenter passage, which is in the form of a nozzle, to the center of thecupola, while the remainder ofthe blast passes into the interior of thecupola atalower pressure. Thus I have provided means where-v by thetwyer will be prevented from being burned out and at the same time bydividing the blast in the manner set forth prevent the cooling of theslag.

For different kinds of Work and to permit of the use of different kindsof fuel it is desirable to arrange the twyers in such manner that theymay be either raised or lowered, as may be found necessary. I havetherefore provided a simple adjusting mechanism for the twyers, as willbe now described.

Upon the back of each twyer is cast two flanges Q and4 R, extending,respectively,

above and below the twyer, as shown in Fig. 3. Each ange is providedwith two vertical slots, such as S, through which securing-bolts T areadapted to extend. The twyer-opening in the shell or casing, as shown,is considerably larger than the twyer, so as to permit ot' the yerticaladjustment of the latter therein, and the anges described are adapted tocover such portions of the twyer-opening as extend beyond the twyer. Toadjust the latter the bolts T, which secure the flanges to the shell, asshown, are loosened and the proper adjustment effected, after which thebolts are secured andthe twyer is in readiness for use.

From the above description of my invention it will be obvious that manymodifications may be made in the construction of the twyer without inany manner departing from my invention as claimed, which consists,essentially, in a compound twyer having means for discharging air intothe interior of the cupola at different pressures. Therefore, while Ihave shown what I consider the most practical form of twyer, I do notdesireV to be limited to the exact construct-ion thereof.

What I claim as my invention isl. A tWyer-iron having twodischarge-passages extending therethrough, the discharge ends of saidpassages being respectively contracted and expanded,for the purpose setforth.

. ,2. vA twyer-iron cast in one piece with twoadjacentdischarge-passages extending therethrough, one of said passagesnarrowing from the inlet to its discharge end and the adjoining passagetapering uniformly in the opposite direction.

3. A twyer-iron having arranged within and cast integral therewith twopartitions converging at their inner ends, forming a centralhigh-pressure passage and two adjoining passages having expandeddischarge ends adapted to discharge air at a lower pressure,substantially as and for the purpose set forth.

,4. In acupola-furnace, the combination of a shell or casing having asingle series of twyeropenings therein extending circu mi'erentiallyabout the casing in substantially the same horizontal plane, and aplurality of twyerirons extending within the openings, each twyer havingtwo discharge-passages therethrough, the discharge ends thereof beingrespectively contracted and expanded.

5. A twyer-iron for cupola-furnaces, having two discharge-passagesextending therethrough, the discharge ends of said passages beingrespectively contracted and expanded,

and slotted flanges at the rear and projecting from the opposite sidesof the twyer iron, substantially as described.

In testimony whereof l affix my signature in presence of two witnesses.

GEORGE A. TRUE.

Witnesses: 4

M. B. ODOGHERTY, H. G. SMiTH.

